If you use Google Chrome exclusively, then that’s the end of things. If you still use Internet Explorer, however, then you’ll get a warning thrown in your face when you click on a mailto: link that mentions IE’s “Protected Mode” and if you want to allow the specified program to open.

This TechNet blog post details exactly what’s happening and why, and most importantly, how to work around it. After following these steps I can now click on mailto: links in IE and have Google Chrome open a new email composition window without any prompts to deal with. Tidy!

I checked and double-checked to make sure I had the correct OAuth Domain Key and Consumer Secret entered, and when it still failed, I re-generated the Consumer Secret. Still no love. After some searching, I came across this thread on Google’s Product Forums:

In a nutshell, when configuring your OAuth Domain Key, you have the option to “Allow Access to All API’s”. For, me this box was checked. Turns out when they say “All API’s”, they didn’t include some new ones that the latest version of the GAMME tool requires. The tool looks for those API’s, can’t access them with the credentials you’ve supplied it, and falls on its face. The fix involves you removing that checkmark next to “Allow Access to All API’s” and then heading to the “Manage Third-Party OAuth Client Access” page. Type in your domain name into the “Client Name” field, and then paste the following into the “One or More API Scopes” field: